nsl {base} | R Documentation

## Look up the IP Address by Hostname

### Description

Interface to `gethostbyname`.

### Usage

    nsl(hostname)

### Arguments

`hostname` | the name of the host.

### Value

The IP address, as a character string, or `NULL` if the call fails.

### Note

This was included as a test of internet connectivity, to fail if the node running R is not connected. It will also return `NULL` if BSD networking is not supported, including the header file ‘`arpa/inet.h`’.

### Examples

    ## Don't run: nsl("www.r-project.org")

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